153 research outputs found
Differential Cross Sections for Higgs Production
We review recent theoretical progress in evaluating higher order QCD
corrections to Higgs boson differential distributions at hadron-hadron
colliders
Differential Cross Sections for Higgs Boson Production at Tevatron Collider Energies
The transverse momentum distribution is computed for inclusive Higgs
boson production at TeV. We include all-orders resummation of
large logarithms associated with emission of soft gluons at small . We
provide results for Higgs boson and masses from to 200 GeV. The
relatively hard transverse momentum distribution for Higgs boson production
suggests possibilities for improvement of the signal to background ratio.Comment: 12 pages, latex, 7 figure
Functional MRI and the Wada test provide complementary information for predicting post-operative seizure control
AbstractPrediction of post-surgical seizure relief and potential cognitive deficits secondary to anterior temporal lobectomy (ATL) are important to pre-surgical planning. Although the intracarotid amobarbital test (IAT) is predictive of post-ATL seizure outcome, development of non-invasive and more precise means for determining post-ATL seizure relief are needed. We previously reported on a technique utilizing functional MRI (fMRI) to evaluate the relative functional adequacy of mesial temporal lobe structures in preparation for ATL . In the present study, we report follow-up outcome data on eight temporal lobe epilepsy (TLE) patients 1-year post-ATL who were evaluated pre-surgically using IAT and fMRI. Functional memory lateralization using fMRI predicted post-ATL seizure outcome as effectively as the IAT. In general, asymmetry of functional mTL activation favouring the non-epileptic hemisphere was associated with seizure-free status at 1-year follow-up. Moreover, when combined, fMRI and IAT provided complementary data that resulted in improved prediction of post-operative seizure control compared with either procedure alone
Resummed Quantum Gravity
We present the current status of the a new approach to quantum general
relativity based on the exact resummation of its perturbative series as that
series was formulated by Feynman. We show that the resummed theory is UV finite
and we present some phenomenological applications as well.Comment: 4 pages, 1 figure; presented at ICHEP0
Next-to-leading Log Resummation of Scalar and Pseudoscalar Higgs Boson Differential Cross-Sections at the LHC and Tevatron
The region of small transverse momentum in q qbar- and gg-initiated processes
must be studied in the framework of resummation to account for the large,
logarithmically-enhanced contributions to physical observables. In this paper,
we will calculate the fixed order next-to-leading order (NLO) perturbative
total and differential cross-sections for both a Standard Model (SM) scalar
Higgs boson and the Minimal Supersymmetric Standard Model's (MSSM) pseudoscalar
Higgs boson in the Heavy Quark Effective Theory (HQET) where the mass of the
top quark is taken to be infinite. Resummation coefficients B^2_g, C^2_gg for
the total cross-section resummation for the pseudoscalar case are given, as
well as C^1_gg for the differential cross-section.Comment: 18 pages, REVTeX4, 5 eps figures. v2: Typos corrected, references
added, a discussion of uncertainties was adde
Dielectric Screening in a Spherical Cavity
In this work we examine the electrostatic screening potential due to a point
charge located off-centre in a spherical dielectric cavity. This potential is
expanded for the case in which the dielectric constant is large,
several methods of finding the terms in the expansion are investigated, and
closed-form expressions are found through third order in along with
error bounds. Finally, possible uses of these expressions in molecular dynamics
simulations of isolated charged molecules is discussed.Comment: 15 Pages, 5 Figures, To be submitted to J. Phys. A. Uses iopart.cl
Scalar Particle Contribution to Higgs Production via Gluon Fusion at NLO
We consider the gluon fusion production cross section of a scalar Higgs boson
in models where fermion and scalar massive colored particles are present. We
report analytic expressions for the matrix elements of , , and processes completing the calculation of the NLO QCD
corrections in these extended scenarios. The formulas are written in a complete
general case, allowing a flexible use for different theoretical models.
Applications of our results to two different models are presented: i) a model
in which the SM Higgs sector is augmented by a weak doublet scalar in the
adjoint representation. ii) The MSSM, in the limit of neglecting the
gluino contribution to the cross section.Comment: 20 pages, 5 figures. Minor changes. Refs. adde
Scalar and Pseudoscalar Higgs Boson Plus One Jet Production at the LHC and Tevatron
The production of the Standard Model (SM) Higgs boson (H) in association with
a jet is compared with that of the lightest scalar Higgs boson (h^0) and the
pseudoscalar Higgs boson (A^0) of the Minimal Supersymmetric Model (MSSM) at
both the CERN Large Hadron Collider (LHC) and the Fermilab Tevatron. We include
both top and bottom quark loops to lowest order in QCD and investigate the
limits of zero quark mass and infinite quark mass.Comment: 14 pages, REVTeX4, 14 eps figures v2: Version accepted for
publication in PR
The impact of heavy-quark loops on LHC dark matter searches
If only tree-level processes are included in the analysis, LHC monojet
searches give weak constraints on the dark matter-proton scattering cross
section arising from the exchange of a new heavy scalar or pseudoscalar
mediator with Yukawa-like couplings to quarks. In this letter we calculate the
constraints on these interactions from the CMS 5.0/fb and ATLAS 4.7/fb searches
for jets with missing energy including the effects of heavy-quark loops. We
find that the inclusion of such contributions leads to a dramatic increase in
the predicted cross section and therefore a significant improvement of the
bounds from LHC searches.Comment: 12 pages, 1 table, 3 figures, v2: extended discussion and improved
relic density calculation - matches published versio
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